Multi-stage neutralization device for laterite nickel ore, and circulation leaching and neutralization system

Abstract

Disclosed in the present application are a multi-stage neutralization device for laterite nickel ore, and a circulation leaching and neutralization system. The multi-stage neutralization device for laterite nickel ore comprises a plurality of neutralization tanks, a plurality of first stirring devices, an ore slurry pipeline, a limestone slurry pipeline and an automatic regulation device, wherein the plurality of neutralization tanks are arranged at intervals in a first direction, and each has a first side and a second side arranged opposite each other in a second direction; the ore slurry pipeline is arranged on the first sides and can be sequentially connected in series to any part or all of the plurality of neutralization tanks; the limestone slurry pipeline is arranged on the second sides and is connected to the plurality of neutralization tanks; and the automatic regulation device can regulate, on the basis of the liquid level in the neutralization tanks, the flow rate of limestone slurry added into the neutralization tanks. In the present application, by using materials resulting from a neutralization reaction in the neutralization tanks to perform buffering, and in cooperation with the automatic regulation device controlling the amount of limestone slurry added, vigorous reactions are avoided while an optimal reaction rate in the neutralization tanks is ensured.

Description

Multi-stage neutralizing device for laterite nickel ore and circulating leaching neutralizing system TECHNICAL FIELD

[0001] The present application relates to the technical field of laterite nickel ore hydrometallurgy, in particular to a multi-stage neutralizing device for laterite nickel ore and a circulating leaching neutralizing system. BACKGROUND

[0002] At present, in the process of laterite nickel ore hydrometallurgy, it is necessary to carry out circulating leaching and multi-stage neutralization reaction after high-pressure leaching or oxygen-pressure leaching to meet the requirements of the next process. In the prior art, multi-stage neutralization generally uses alkali or limestone slurry. The former reaction is easy to control, but the price is relatively high. The latter is cheap, but the reaction is relatively violent, so the flow rate needs to be controlled when adding limestone slurry, which leads to low neutralization efficiency.

[0003] SUMMARY

[0004] The present application aims to overcome the above technical deficiencies and provide a multi-stage neutralizing device for laterite nickel ore to solve the technical problem of low multi-stage neutralization efficiency in the process of laterite nickel ore hydrometallurgy in the prior art.

[0005] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0006] The present application provides a multi-stage neutralizing device for laterite nickel ore, comprising:

[0007] A plurality of neutralizing tanks, a plurality of the neutralizing tanks are arranged at intervals along a first direction, a plurality of the neutralizing tanks have a first side and a second side arranged oppositely along a second direction, and the first direction and the second direction are perpendicular to each other;

[0008] A plurality of first stirring devices, a plurality of the first stirring devices correspond to a plurality of the neutralizing tanks one by one, and the first stirring device is arranged in the corresponding neutralizing tank;

[0009] A slurry pipeline, the slurry pipeline is arranged on the first side and can sequentially connect any part or all of the neutralizing tanks in a plurality of the neutralizing tanks;

[0010] A limestone slurry pipeline, the limestone slurry pipeline is arranged on the second side, and the limestone slurry pipeline is connected with a plurality of the neutralizing tanks respectively; and

[0011] An automatic control device, which controls the flow rate of limestone slurry according to the liquid level in the neutralizing tank.

[0012] In some embodiments, the limestone slurry pipeline comprises a first main pipeline and a plurality of connecting pipelines corresponding to the plurality of neutralization tanks, each of the connecting pipelines comprises an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are arranged in a first direction, one end of the inlet pipe and the outlet pipe are connected to the neutralization tank, the other end of the inlet pipe and the outlet pipe are connected to the first main pipeline, and the distance between the inlet pipe and the outlet pipe in the same connecting pipeline gradually increases in a direction away from the neutralization tank.

[0013] In some embodiments, the angle between the inlet pipe and the outlet pipe in the same connecting pipeline is not less than 120°.

[0014] In some embodiments, the inlet pipe is provided with a first valve, the outlet pipe is provided with a second valve, the first main pipeline is provided with a plurality of third valves, the plurality of third valves correspond to the plurality of neutralization tanks, and the third valve is located between the inlet pipe and the outlet pipe in the same connecting pipeline.

[0015] In some embodiments, the first main pipeline is further provided with a plurality of upwardly extending observation ports, and each of the observation ports is located between the outlet pipe of an adjacent upper neutralization tank and the inlet pipe of an adjacent lower neutralization tank in the direction of the flow of the limestone slurry.

[0016] In some embodiments, the automatic control device comprises a control device, a plurality of detection devices, and a plurality of flow valves, the plurality of detection devices and the plurality of flow valves are arranged corresponding to the plurality of neutralization tanks, the detection device is used to detect the liquid level or the pH value of the material in the neutralization tank, each of the flow valves is installed at the connection between the neutralization tank and the limestone slurry pipeline, the control device is electrically connected to the plurality of flow valves and the plurality of detection devices, and the control device is used to control the opening degree of the corresponding flow valve according to the liquid level or the pH value of the material in each of the neutralization tanks.

[0017] In some embodiments, the detection device comprises a pH detector and a liquid level meter, the pH detector is located in the neutralization tank at the end in the direction of the flow of the limestone slurry, and the liquid level meter is located in the remaining neutralization tanks.

[0018] In some embodiments, the limestone slurry pipeline is connected to the bottom or the top of the neutralization tank.

[0019] Further, the application also provides a circulating leaching and neutralization system, comprising a mixing tank, a leaching tank and the multi-stage neutralization device for laterite nickel ore, the discharge end of the mixing tank is communicated with the feeding end of the leaching tank, and the discharge end of the leaching tank is connected with the feeding end of the ore slurry pipeline, wherein the mixing tank is located above the leaching tank, and the diameter of the mixing tank is smaller than the diameter of the leaching tank.

[0020] In some embodiments, the mixing tank is also connected with the feeding end of the ore slurry pipeline through a connecting pipeline.

[0021] Compared with the prior art, the multi-stage neutralization device for laterite nickel ore provided by the application is characterized in that a plurality of neutralization tanks are arranged along a first direction, a plurality of the neutralization tanks have a first side and a second side arranged oppositely along a second direction, a first stirring device is arranged in each of the neutralization tanks, the ore slurry pipeline and the limestone slurry pipeline are arranged on the first side and the second side respectively, the ore slurry pipeline is used for conveying ore slurry into the neutralization tank, the limestone slurry pipeline is used for conveying limestone slurry into the neutralization tank, the ore slurry pipeline and the limestone slurry pipeline are located on opposite sides of the neutralization tank, so that the ore slurry and the limestone slurry first contact the material after neutralization reaction in the neutralization tank, the ore slurry and the limestone slurry are dispersed into the material after neutralization reaction, the material after neutralization reaction in the neutralization tank is used for buffering, so as to avoid the direct contact of the ore slurry and the limestone slurry conveyed into the neutralization tank, and the automatic control device is used for controlling the addition amount of the limestone slurry, so as to avoid causing violent reaction, ensure the optimal reaction rate in the neutralization tank, and the first stirring device is arranged in each of the neutralization tanks, so as to promote the neutralization reaction of the limestone slurry and the ore slurry.

[0022] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and the application can be implemented according to the content of the description, and the preferred embodiments of the application are described in detail below with the help of the drawings. The specific embodiments of the application are described in detail below with the help of the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a structural schematic view of an embodiment of the multi-stage neutralization device for laterite nickel ore provided by the application;

[0024] Fig. 2 is a top view of the multi-stage neutralization device for laterite nickel ore in Fig. 1.

[0025] Explanation of reference signs: 100 - multi-stage neutralization device for laterite nickel ore, 1 - neutralization tank, 2 - first stirring device, 3 - ore slurry pipeline, 31 - feeding pipe, 32 - discharging pipe, 33 - first main pipe, 34 - first valve, 35 - second valve, 36 - third valve, 4 - limestone slurry pipeline, 41 - second main pipe, 42 - branch pipe, 43 - fourth valve, 44 - flow valve, 200 - circulating leaching neutralization system, 210 - mixing tank, 220 - leaching tank, 230 - second stirring device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0027] In order to solve the technical problem of low multi-stage neutralization efficiency in the hydrometallurgical process of laterite nickel ore in the prior art, the present application provides a multi-stage neutralization device for laterite nickel ore. The ore slurry pipeline and the limestone slurry pipeline are located on opposite sides of the neutralization tank, so that the ore slurry and the limestone slurry first contact the material after neutralization reaction in the neutralization tank, dispersing the ore slurry and the limestone slurry into the reacted material, buffering the material after neutralization reaction in the neutralization tank to avoid direct contact between the ore slurry and the limestone slurry transported into the neutralization tank, which causes violent reaction, and each neutralization tank is also provided with the first stirring device, which can promote the neutralization reaction of the limestone slurry and the ore slurry, ensuring the neutralization efficiency.

[0028] Please refer to FIG. 1, which is a structural schematic diagram of the multi-stage neutralization device for laterite nickel ore in an embodiment of the present application.

[0029] The present application provides a multi-stage neutralization device 100 for laterite nickel ore, which comprises a plurality of neutralization tanks 1, a plurality of first stirring devices 2, an ore slurry pipeline 3, a limestone slurry pipeline 4 and an automatic control device. The plurality of neutralization tanks 1 are arranged at intervals along a first direction, and the plurality of neutralization tanks 1 have a first side and a second side oppositely arranged along a second direction, and the first direction and the second direction are perpendicular to each other. The plurality of first stirring devices 2 correspond to the plurality of neutralization tanks 1 one by one, and the first stirring device 2 is arranged in the corresponding neutralization tank 1. The ore slurry pipeline 3 is arranged on the first side and can be connected in series with any part or all of the plurality of neutralization tanks 1. The limestone slurry pipeline 4 is arranged on the second side and connected with the plurality of neutralization tanks 1 respectively. The automatic control device controls the flow rate of limestone slurry added into the neutralization tank 1 according to the liquid level in the neutralization tank 1.

[0030] In the embodiment, referring to FIGS. 1-2, a plurality of the neutralizing tanks 1 are arranged at intervals along a first direction, each of the neutralizing tanks 1 has a first side and a second side arranged oppositely along a second direction, each of the neutralizing tanks 1 is provided with a first stirring device 2, the ore pulp pipeline 3 and the limestone slurry pipeline 4 are arranged at the first side and the second side respectively, the ore pulp pipeline 3 is used for conveying ore pulp into the neutralizing tank 1, the limestone slurry pipeline 4 is used for conveying limestone slurry into the neutralizing tank 1, the ore pulp pipeline 3 and the limestone slurry pipeline 4 are located at opposite sides of the neutralizing tank 1, so that the ore pulp and the limestone slurry first contact with the material after neutralization reaction in the neutralizing tank 1, the ore pulp and the limestone slurry are dispersed into the material after neutralization reaction, the material after neutralization reaction in the neutralizing tank 1 is used for buffering, and the amount of limestone slurry is controlled by the automatic control device, so that the neutralizing tank 1 is in the best reaction rate while avoiding violent reaction, and each of the neutralizing tanks 1 is further provided with the first stirring device 2, which can promote the neutralization reaction of the limestone slurry and the ore pulp and ensure the neutralization efficiency.

[0031] In the embodiment, the side wall of the first side of the neutralizing tank 1 is provided with an ore pulp inlet and an ore pulp outlet, the ore pulp pipeline 3 connects the ore pulp inlet and the ore pulp outlet of adjacent neutralizing tanks 1, so that the plurality of neutralizing tanks 1 are arranged in series, the ore pulp flows into the plurality of neutralizing tanks 1 in sequence, and the ore pulp reacts with the limestone slurry in each of the neutralizing tanks 1 to complete multi-stage neutralization reaction; the side wall of the second side of the neutralizing tank 1 is provided with a limestone slurry inlet, and the limestone slurry pipeline 4 connects a plurality of the limestone slurry inlets to convey limestone slurry into the plurality of neutralizing tanks 1 simultaneously.

[0032] In some embodiments, the ore pulp pipeline 3 includes a first main pipeline 33 and a plurality of connection pipelines corresponding to the plurality of neutralizing tanks 1 one by one, each of the connection pipelines includes an inlet pipe 31 and an outlet pipe 32, the inlet pipe 31 and the outlet pipe 32 are arranged at intervals along a first direction, one end of the inlet pipe 31 and the outlet pipe 32 is connected to the neutralizing tank 1, the other end of the inlet pipe 31 and the outlet pipe 32 is connected to the first main pipeline 33, and the distance between the inlet pipe 31 and the outlet pipe 32 in the same connection pipeline gradually increases away from the neutralizing tank 1.

[0033] In the embodiment, since the ore pulp pipeline 3 needs to be connected with multiple neutralizing tanks 1 in series, the first main pipeline 33 is arranged to extend along the first direction, and the first main pipeline 33 is located on the first side, the feeding end of the first main pipeline 33 is communicated with the leaching tank, the two ends of each feeding pipe 31 are respectively communicated with the ore pulp inlet of the corresponding neutralizing tank 1 and the first main pipeline 33, and the two ends of each discharge pipe 32 are respectively communicated with the ore pulp outlet of the corresponding neutralizing tank 1 and the first main pipeline 33, so that the multiple neutralizing tanks 1 can be connected in series, and the distance between the feeding pipe 31 and the discharge pipe 32 gradually increases in the direction away from the neutralizing tank 1, that is, the feeding pipe 31 and the discharge pipe 32 connected with the same neutralizing tank 1 are arranged in a splayed shape, so that the ore pulp can be conveniently fed into and discharged from the neutralizing tank 1.

[0034] In some embodiments, the included angle between the feeding pipe 31 and the discharge pipe 32 in the same connecting pipeline is not less than 120°. The larger the included angle between the feeding pipe 31 and the discharge pipe 32 is, the more conducive to the ore pulp feeding into and discharging from the neutralizing tank 1.

[0035] In some embodiments, the feeding pipe 31 is provided with a first valve 34, the discharge pipe 32 is provided with a second valve 35, the first main pipeline 33 is provided with multiple third valves 36, and the multiple third valves 36 correspond to the multiple neutralizing tanks 1 one by one, and the third valve 36 is located between the feeding pipe 31 and the discharge pipe 32 in the same connecting pipeline.

[0036] In the embodiment, generally one of the multiple neutralizing tanks 1 is selected as a standby, that is, when normally used, the standby neutralizing tank 1 is idle. In order to achieve the above purpose, the feeding pipe 31 is provided with a first valve 34, the discharge pipe 32 is provided with a second valve 35, and the first main pipeline 33 is provided with a third valve 36, and correspondingly, the connection between the limestone slurry pipeline 4 and each neutralizing tank 1 is provided with a fourth valve 43. In specific use, the first valve 34, the second valve 35 and the fourth valve 43 of the standby neutralizing tank 1 are closed, and the third valve 36 is opened, so that the ore pulp directly enters the next neutralizing tank 1 through the first main pipeline 33, and the limestone slurry also does not enter the neutralizing tank 1. By setting the standby neutralizing tank 1, on the one hand, when other neutralizing tanks 1 are repaired or damaged, the ore pulp can be controlled by the valve to not pass through the neutralizing tank 1 but enter the standby neutralizing tank 1 for reaction, so that the multi-stage neutralization reaction can be smoothly carried out, and on the other hand, when the next process needs to reduce the flow, part of the ore pulp can be diverted to the standby neutralizing tank 1 as a temporary storage container.

[0037] It should be noted that the above-mentioned valve can be a manual valve or an electric valve, and the present application is not limited in this regard.

[0038] In some embodiments, the first main pipeline 33 is further provided with a plurality of upwardly extending observation openings, and each of the observation openings is located between the discharge pipe 32 and the feed pipe 31 of two adjacent neutralization tanks 1, which are the discharge pipe 32 of the upper stage neutralization tank 1 and the feed pipe 31 of the lower stage neutralization tank 1 along the direction of the flow of the ore slurry.

[0039] In the present embodiment, the ore slurry pipeline 3 further comprises an observation pipe, which is arranged to extend in the vertical direction, and the lower end of the observation pipe is in communication with the first main pipeline 33, thereby forming the observation opening, and the height of the observation pipe is less than the height of the neutralization tank 1. By providing the observation opening, the liquid level of the ore slurry can be observed in real time, and if the ore slurry overflows from the observation opening, it indicates that the neutralization reaction in the neutralization tank 1 is too violent, and at this time, the amount of the limestone slurry input into the neutralization tank 1 needs to be reduced.

[0040] In the present embodiment, the limestone slurry pipeline 4 comprises a second main pipeline 41 and a plurality of branch pipelines 42, the second main pipeline 41 is arranged to extend in the first direction, and the second main pipeline 41 is located at the second side, and the plurality of branch pipelines 42 correspond to the plurality of neutralization tanks 1 one by one, and each of the branch pipelines 42 is in communication with the neutralization tank 1 and the second main pipeline 41, respectively.

[0041] Specifically, the branch pipeline 42 is in communication with the limestone slurry inlet, and the fourth valve 43 is arranged on the branch pipeline 42.

[0042] In some embodiments, the automatic control device comprises a control device, a plurality of detection devices, and a plurality of flow valves 44, the plurality of detection devices and the plurality of flow valves are arranged one by one corresponding to the neutralization tanks 1, the detection devices are used to detect the liquid level or the pH value of the materials in the neutralization tanks 1, each of the flow valves 44 is installed at the connection between the neutralization tank 1 and the limestone slurry pipeline 4, the control device is electrically connected with the plurality of flow valves 44 and the plurality of detection devices, and the control device is used to control the opening degree of the corresponding flow valves 44 according to the liquid level value or the pH value of the materials in each of the neutralization tanks 1.

[0043] In the embodiment, in order to ensure that the neutralizing tank 1 is in the optimal reaction rate, each neutralizing tank 1 is further provided with a detection device capable of detecting the liquid level or pH value of the material in the corresponding neutralizing tank 1, the flow valve 44 is arranged on the branch pipeline 42 and capable of controlling the flow of the limestone slurry into the neutralizing tank 1, and the control device is electrically connected with the plurality of flow valves 44 and the plurality of detection devices and capable of controlling the input amount of the limestone slurry according to the liquid level or pH value in each neutralizing tank 1, so as to avoid violent neutralization reaction and ensure the neutralization efficiency as much as possible.

[0044] In some embodiments, the detection device includes a pH detector and a liquid level meter, the pH detector is arranged in the neutralizing tank 1 at the end along the flow direction of the slurry, and the liquid level meter is arranged in the remaining neutralizing tanks 1.

[0045] In the embodiment, the pH of the last-stage neutralizing tank 1 has approached or met 2.2-2.5, so the last-stage neutralizing tank 1 does not need to add excess limestone slurry and violent neutralization reaction does not occur in the last-stage neutralizing tank 1, and therefore the end neutralizing tank 1 only needs to detect the pH value of the material therein, and the remaining neutralizing tanks 1 have the possibility of violent neutralization reaction, so the liquid level meter needs to be arranged in the remaining neutralizing tanks 1 to detect the liquid level of the material therein, and in specific use, when the liquid level in a neutralizing tank 1 is lower than a set value, the flow valve 44 can be controlled to increase the input amount of the limestone slurry to ensure the reaction efficiency, and when the liquid level in a neutralizing tank 1 is higher than a set value, the flow valve 44 can be controlled to reduce the input amount of the limestone slurry to avoid violent reaction, so that the opening size of the flow valve 44 can be controlled according to the liquid level of the liquid level meter, and the neutralizing tank 1 is ensured to be in the optimal reaction rate.

[0046] In some embodiments, the limestone slurry pipeline 4 is connected with the bottom or top of the neutralizing tank 1.

[0047] The connection position of the branch pipeline 42 with the neutralizing tank 1 is not limited, and the branch pipeline 42 can be connected with the top of the neutralizing tank 1 or the middle or lower part of the neutralizing tank 1, and in the embodiment, the branch pipeline 42 is connected with the bottom of the neutralizing tank 1, so that when the carbon dioxide generated in the neutralization reaction rises, the material can be disturbed, which helps to reduce the liquid level after the reaction and improve the reaction uniformity and completeness.

[0048] In the embodiment, the first stirring device 2 comprises a stirring shaft, two stirring paddles and a stirring motor, the stirring shaft is rotatably arranged in the neutralizing tank 1 along an axis in the vertical direction, the two stirring paddles are arranged on the stirring shaft in the vertical direction, and the stirring motor is connected with the upper end of the stirring shaft. By arranging the two stirring paddles, the materials in the neutralizing tank 1 can be fully stirred, which helps the lime stone slurry and the ore slurry to fully contact and promotes the uniformity and efficiency of the neutralization reaction.

[0049] In the embodiment, the top of the neutralizing tank 1 is further provided with an exhaust pipe for exhausting the carbon dioxide generated in the neutralization reaction.

[0050] In addition, the application further provides a circulating leaching and neutralizing system 200, which comprises a mixing tank 210, a leaching tank 220 and the multi-stage neutralizing device 100 for laterite nickel ore. The discharge end of the mixing tank 210 is communicated with the feeding end of the leaching tank 220, and the discharge end of the leaching tank 220 is connected with the feeding end of the ore slurry pipeline 3. The mixing tank 210 is located above the leaching tank 220, and the diameter of the mixing tank 210 is smaller than that of the leaching tank 220.

[0051] In the embodiment, the leaching tank 220 and the plurality of neutralizing tanks 1 are arranged in the first direction, and the mixing tank 210 is located at the top of the leaching tank 220. The ore slurry flows through the leaching tank 220 and the plurality of neutralizing tanks 1 in sequence from the mixing tank 210. The mixing tank 210 can be used as a reaction tank, and the leaching tank 220 is used for redundant transition to facilitate the delivery of the ore slurry into the neutralizing tank 1.

[0052] In the embodiment, the second stirring device 230 is arranged in the mixing tank 210 and the leaching tank 220. The second stirring device 230 arranged in the mixing tank 210 is used for fully mixing to promote the mixing reaction, and the second stirring device 230 arranged in the leaching tank 220 is used for ensuring continuous reaction, promoting continuous leaching of nickel, cobalt and manganese, and having a certain buffering effect to avoid excessive impact of the feeding on the neutralizing tank 1.

[0053] In some embodiments, the mixing tank 210 is further connected with the feeding end of the ore slurry pipeline 3 through a connecting pipeline.

[0054] In the embodiment, in order to avoid the production line being stopped when the leaching tank 220 is overhauled, the mixing tank 210 is further connected with the feeding end of the ore slurry pipeline 3 through a connecting pipeline. In this way, when the leaching tank 220 is overhauled, the mixing tank 210 can directly deliver the ore slurry into the neutralizing tank 1, so that the production line can be avoided from being stopped.

[0055] It can be understood that the connecting pipe and the pipe connecting the mixing tank 210 and the leaching tank 220 are provided with valves. In normal use, the valve on the connecting pipe is closed, so that the ore pulp is transported into the leaching tank 220. When the leaching tank 220 is overhauled, the valve on the pipe between the mixing tank 210 and the leaching tank 220 is closed, and the valve on the connecting pipe is opened, so that the ore pulp is transported from the mixing tank 210 into the neutralization tank 1.

[0056] In order to better understand the present application, the technical solutions of the present application will be described in detail below in combination with FIGS. 1-2:

[0057] The ore pulp continuously reacts and leaches nickel, cobalt and manganese in the mixing tank 210 and the leaching tank 220, and then is transported into the neutralization tank 1 through the first main pipe 33 and the feed pipe 31, while the limestone slurry is transported into the neutralization tank 1 through the second main pipe 41 and the branch pipe 42. The ore pulp and the limestone slurry undergo neutralization reaction, and the generated carbon dioxide is discharged from the neutralization tank 1 through the exhaust pipe. The ore pulp enters the multiple neutralization tanks in sequence through the feed pipe 31 and the discharge pipe 32, and the multiple neutralization tanks 1 simultaneously undergo neutralization reaction. When the liquid level in a certain neutralization tank 1 is lower than a set value, the control device controls the flow valve 44 to increase the input amount of limestone slurry to ensure the reaction efficiency. When the liquid level in a certain neutralization tank 1 is higher than a set value, the control device controls the flow valve 44 to reduce the input amount of limestone slurry to avoid violent reaction and ensure that the neutralization tank 1 is in the optimal reaction rate.

[0058] The specific embodiments of the present application described above do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A multi-stage neutralization device for laterite nickel ore, characterized by, The application relates to a neutralization system for a mineral slurry, which comprises: a plurality of neutralization tanks, the plurality of neutralization tanks being arranged in a first direction, the plurality of neutralization tanks having a first side and a second side arranged oppositely in a second direction, the first direction and the second direction being perpendicular to each other; a plurality of first stirring devices, the plurality of first stirring devices corresponding to the plurality of neutralization tanks one by one, the first stirring device being arranged in the corresponding neutralization tank; a mineral slurry pipeline, the mineral slurry pipeline being arranged on the first side, and being capable of connecting any part or all of the plurality of neutralization tanks in series; a limestone slurry pipeline, the limestone slurry pipeline being arranged on the second side, the limestone slurry pipeline being connected to the plurality of neutralization tanks respectively; and an automatic control device, the automatic control device being used for controlling the adding flow of the limestone slurry according to the liquid level in the neutralization tank. The mineral slurry pipeline comprises a first main pipeline and a plurality of connecting pipelines corresponding to the plurality of neutralization tanks one by one, each connecting pipeline comprises an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are arranged in the first direction, one end of the inlet pipe and the outlet pipe is connected to the neutralization tank, the other end of the inlet pipe and the outlet pipe is connected to the first main pipeline, the distance between the inlet pipe and the outlet pipe in the same connecting pipeline gradually increases in the direction away from the neutralization tank.

2. The multi-stage neutralization apparatus for laterite nickel ore according to claim 1, characterized by, The angle between the inlet pipe and the outlet pipe in the same connecting pipeline is not less than 120 degrees.

3. The multi-stage neutralization apparatus for nickel laterite ore according to claim 2, characterized by, The inlet pipe is provided with a first valve, the outlet pipe is provided with a second valve, the first main pipeline is provided with a plurality of third valves, the plurality of third valves correspond to the plurality of neutralization tanks one by one, the third valve is located between the inlet pipe and the outlet pipe in the same connecting pipeline.

4. The multi-stage neutralization apparatus for nickel laterite ore according to claim 2, characterized by, The first main pipeline is further provided with a plurality of upward extending observation openings, each observation opening is located between the outlet pipe and the inlet pipe of adjacent two neutralization tanks, the outlet pipe and the inlet pipe of adjacent two neutralization tanks are the outlet pipe of an upper stage neutralization tank and the inlet pipe of a lower stage neutralization tank in the mineral slurry flow direction.

5. The multi-stage neutralization apparatus for nickel laterite ore according to claim 2, characterized by, The automatic control device comprises a control device, a plurality of detection devices and a plurality of flow valves, the plurality of detection devices and the plurality of flow valves are arranged corresponding to the plurality of neutralization tanks one by one, the detection device is used for detecting the liquid level or the pH value of the material in the neutralization tank, each flow valve is installed at the connection position between the neutralization tank and the limestone slurry pipeline, the control device is electrically connected to the plurality of flow valves and the plurality of detection devices, the control device is used for controlling the opening degree of the corresponding flow valve according to the liquid level value or the pH value of the material in each neutralization tank.

6. The multi-stage neutralization apparatus for nickel laterite ore according to claim 1, characterized by, The detection device comprises a pH detector and a liquid level meter, the pH detector is located in the neutralization tank at the end in the mineral slurry flow direction, and the liquid level meter is located in the remaining neutralization tanks.

7. The multi-stage neutralization apparatus for nickel laterite ore according to claim 6, characterized by, The limestone slurry pipeline is connected to the bottom or the top of the neutralization tank.

8. The multi-stage neutralization apparatus for nickel laterite ore according to claim 1, characterized by, ​ 9. A cyclic leach neutralization system characterized by, The multi-stage neutralization device for laterite nickel ore comprises a mixing tank, a leaching tank and a multi-stage neutralization device for laterite nickel ore according to any one of claims 1-8, a discharge end of the mixing tank is communicated with a feed end of the leaching tank, and a discharge end of the leaching tank is connected with a feed end of the ore slurry pipeline, wherein the mixing tank is located above the leaching tank, and a diameter of the mixing tank is smaller than a diameter of the leaching tank.

10. The cyclic leach neutralization system of claim 9, wherein, The mixing tank is also connected with the feed end of the ore slurry pipeline through a connecting pipeline.

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